Virus Shield was a $3.99 app that promised it could protect your phone from harmful spyware and malware invading your device.

It also claimed it would have battery life improvements and “no pesky advertisements.”

Despite having over 10,000 downloads and multiple high ratings, the app didn’t work, Crider says. Android Police writes that it was just a fake: All Virus Shield did was switch from a red “X” image to a “√” check image with a single tap.

Android Police points out that Deviant Solutions (the alleged developers behind the app) don’t have an official website in the Play Store and people on Google+ have complained about Virus Shield as well.